Charles L St Petersburg , FL November 23, 2014 Appliance: Magic Chef Refrigerator MCBR1020W Magic Chef Refrigerator Mcbr1020w: Refrigerator stopped cooling it would run for a few hours after turning the dial on the defrost timer when it was time for the refrigerator to defrost the timer would get stuck in defrost mode. How to replace Defrost Timer. Replaced defrost timer Do-It-Yourself Rating: Repair Time Estimate: Less than 15 minutes